An invaluable tool for capturing perfect images Correct exposure is the essence of good photography, and with these neutral test targets you can eliminate errors. When you take reflected-light meter readings off of a Kodak Gray Card rather than a subject of unknown reflectance, you are guaranteed more accurate exposures. You will be delighted by the "true-to-life" colors and tones in your photographs, digital images, and videos. The cards are also useful for calibrating exposure meters and determining lighting ratios. Package includes one 4 x 5 inch and two 8 x 10 inch Gray Cards along with complete instructions for use.